A metallic sound from bridge pin/string?

[ed440 at mindspring.com]

Dave-

First you will need to diagnose very carefully. Is it one string that is giving trouble, or all three of the unison?
Is it the left string? Is it possible the bridge was planed a little too heavily on the front edge before notching?  If so, with some clever mini-woodworking, you could add some wood to the bridge cap (maybe just a tiny shim).

Do you have a downbearing gauge to take measurements here?

Or is there something odd about the wire? Could a kink just behind the bridge pin be causing the trouble?

Before you do drastic work, you might change the hammer and see what happens. No hypothesis, just check it, since it's easy to do.  Maybe a hard place in the hammer?

You could probably slip a piece of veneer under the string to see if raising the edge of the bridge cap would help.

Enjoy!

Ed Sutton

-----Original Message-----
>From: piannaman at aol.com
>Sent: Sep 30, 2006 1:21 PM
>To: pianotech at ptg.org
>Subject: Re: A metallic sound from bridge pin/string?
>
> Patrick,
> 
>This strikes me as a very real possibility.  The string seems to be working its way back up the bridge pin for whatever reason.  Negative downbearing seems like a culprit.  
> 
>How would I go about increasing the downbearing for one note, though?  
> 
>Still feeling like a novice,
> 
>Dave Stahl
>
> 
>-----Original Message-----
>From: jpdraine at gmail.com
>To: pianotech at ptg.org
>Sent: Sat, 30 Sep 2006 6:22 AM
>Subject: Re: Re: A metallic sound from bridge pin/string?
>
>
>Dave, 
>With all the various suggestions about string seating and bridge pin 
>tapping & gluing, I'm surprised noone has brought up the possibility 
>of negative downbearing as a potential cause. 
>Good luck! 
>PS Is the customer complaining or is it just driving *you* over the edge? 
>Patrick 
> 
>On 9/30/06, piannaman at aol.com <piannaman at aol.com> wrote: 
>> 
>> Thanks, Larry. It's a grand with agraffes in that particular section. The 
>> sound goes away with pressure on the string at the front bridge pin. 
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